Prohibiting the storage of food in chemical refrigerators is one of the basic rules of good practice. It is intended to prevent the ingestion of toxic or infectious materials. The food will absorb the vapors from the chemicals in the refrigerator and then they'll be consumed.
Post a clear warning sign on any chemical refrigerator: "Chemicals Only; Do Not Store Your Food Here." Assign one person the responsibility for each refrigerator. They can check it periodically to be sure there's no food and no unlabeled containers. They can also see that the inventory list is up to date, the refrigerator is functioning properly and does not need to be defrosted.
